Bohr’s Model of an atom.
Postulates.
1. An atom consists of a small heavy positively charged nucleus in the centre surrounded by electrons. The electrons in an atom revolve around the nucleus only in certain selected circular paths called orbits.
2. As long as the electron remains in a particular orbit, it does not lose or gain energy.
3. Only those orbits are permitted in which the angular momentum of the electron is a whole number multiple of h / 2p.
4.The energy is emitted or absorbed only when the electrons jump from one energy level to another.
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